French chemist and microbiologist, Louis Pasteur, created vaccines. Due to his discoveries, his work in germ theory also led him and his team to create vaccinations for anthrax, rabies, and other vaccinations. Vaccines main purpose is to prevent diseases or infections by slowing down the effects of a disease.
Vaccines can lessen death rates by stopping, slowing down, or preventing illnesses or diseases. Pasteur gave a gateway into more vaccines or a starting point into the research to more vaccines. Pasteur helped save the silk industry by proving that microbes were attacking healthy silkworm eggs, causing an unknown disease and that the disease would be eliminated if the microbes were eliminated. One of Pasteur's first vaccine discoveries was for a disease called chicken cholera. After accidentally exposing chickens to the unnaturally thin form of a culture, he demonstrated that they became resistant to the actual virus. Pasteur went on to extend his germ theory to develop causes and vaccinations for diseases such as anthrax, cholera, TB, and smallpox.
Ullmann, Agnes. “Vaccine Development.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 25 July 2017, www.britannica.com/biography/Louis-Pasteur/Vaccine-development.